US20130234485A1 - Office chair mechanism provided with a device for adjusting the swivel force - Google Patents
Office chair mechanism provided with a device for adjusting the swivel force Download PDFInfo
- Publication number
- US20130234485A1 US20130234485A1 US13/879,970 US201113879970A US2013234485A1 US 20130234485 A1 US20130234485 A1 US 20130234485A1 US 201113879970 A US201113879970 A US 201113879970A US 2013234485 A1 US2013234485 A1 US 2013234485A1
- Authority
- US
- United States
- Prior art keywords
- lever
- office chair
- chair mechanism
- movable
- biasing element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03283—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with fluid springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03205—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination
- A47C1/03238—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest having adjustable and lockable inclination by means of peg-and-notch or pawl-and-ratchet mechanism
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03266—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with adjustable elasticity
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03294—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest slidingly movable in the base frame, e.g. by rollers
Definitions
- the present invention relates to an office chair mechanism provided with a device for adjusting the swivel force.
- the main drawback of this system is the fact that the preload adjustment cannot be too large otherwise insurmountable problems are introduced relating to spring reliability and chair design compactness.
- an always critical compromise has to be reached between the physical force and the down-gearing (large number of screw turns) required for the adjustment.
- the main drawback from the ergonomic viewpoint is that because the force increase during swivelling is always constant and if a “light” user encounters excessive hardness during swivelling, this for a “heavy” user could possibly be insufficient.
- An object of the invention is to eliminate these drawbacks by providing an adjustment device which while being compact, sufficiently economical and of simple and very wide adjustment, is also ergonomically suitable for both very light and very heavy users.
- FIG. 1 is a lateral schematic view of a chair provided with the device of the invention in its non-stressed condition
- FIG. 2 shows it in the same view as FIG. 1 but in the stressed condition
- FIG. 3 is an exploded perspective view of the device of the invention showing the adjustment system in detail
- FIGS. 4 and 5 are schematic views of the device of the invention shown respectively in the chair empty and chair stressed configuration
- FIGS. 6 and 7 show the device in the same views as FIGS. 4 and 5 but with the fulcrum in a different position
- FIGS. 8 and 9 are schematic views of two different embodiments of the device of the invention.
- FIGS. 10 , 11 and 12 show a detail of the device of the invention for locking chair swivelling.
- the adjustment device according to the invention is applied to an office chair mechanism consisting of a fixed box structure 2 provided lowerly with a frusto-conical bush for inserting the upper end of the shaft 4 of a traditional gas spring (not represented in the drawings), the function of which is to sustain the support as it swivels relative to a resting base 6 .
- the fixed box structure 2 is hinged about a pin 8 slidable within a horizontal slotted hole 10 provided in a support plate 12 for the chair seating portion 14 .
- a bar 18 rigid with a support arm 20 for the back rest 22 is pivoted about a pin 16 on the plate 12 .
- the beam is finally pivoted to the box structure 2 about a pin 24 .
- a lever shaped bar 28 with its fulcrum on a contact element 30 , in the illustrated example a pin, selectively positionable along two resting surfaces 32 , 32 ′ provided on the box structure 2 and on the lever 28 .
- the other end 36 of the lever 28 acts on a helical spring 38 which acts against the surface of the box structure (see FIGS. 4-7 ) or against the chair support plate 12 (see FIG. 8 ) or against the support bar 18 for the back rest 22 (see FIG. 9 ).
- the adjustment of the position of the contact element 30 takes place along said parallel resting surfaces 32 , 32 ′, by which any other movement of the helical spring 38 and of the lever 28 is avoided.
- the element which undergoes movement is not subjected to compression when the surfaces are parallel, i.e. when the chair is in the rest position, whereas it becomes the fulcrum of the lever 28 during swivelling.
- the elements involved in the adjustment are therefore reduced to a minimum. This characteristic therefore enables easy and quick adjustment while using reliable low-cost components, for example by using a simple cam device 34 which moves the contact element (pin) 30 .
- the lever has a shape such that the contact element 30 , following its adjustment movement, maximizes the difference between the two lever arms.
- the cam device is mounted on a single control rod 40 which is provided at one end with a knob 42 for rotating the cam 34 and with a knob 44 for operating a gas spring, and at the other end with a knob 46 for locking the rotation of the back rest.
- slide shoes 48 of self-lubricating plastic material are provided (wrapped about the pin).
- a catch is provided formed from two plates 50 operable axially by an elastic puller 52 connected to the knob 46 controlling the locking operation.
- the plates 50 are selectively insertable into two of a plurality of facing seats 54 (six in the illustrated example) provided in the bar 18 such as to lock its rotation and hence lock the chair.
- the operating principle of the device of the invention is as follows.
- FIGS. 4 and 5 show the spring compression as the chair passes from a configuration in which the chair is not stressed to a configuration in which a user is seated on the chair and has inclined the back rest rearwards to hence stress the spring.
- FIGS. 6 and 7 show the chair in the same configurations as in FIGS. 4 and 5 , but with the fulcrum 30 shifted along the surfaces 32 , 32 ′ in the sense of causing it to approach the axis of the pivot pin 16 .
- R′ Pb 2 ′ ⁇ b 1 ′
Abstract
Description
- The present invention relates to an office chair mechanism provided with a device for adjusting the swivel force.
- To modify the swivel force for the different body weights and preferences of different office chair users, various mechanism adjustment devices have already been proposed, however these mostly act on the preloading of springs.
- If compression springs are used, an adjustment knob coaxial to the spring is operated. However, if torsion springs are used, the preload is varied by using elements which pull or push the free end of the spring.
- The main drawback of this system is the fact that the preload adjustment cannot be too large otherwise insurmountable problems are introduced relating to spring reliability and chair design compactness. In addition to overcome the spring force during adjustment, an always critical compromise has to be reached between the physical force and the down-gearing (large number of screw turns) required for the adjustment. However the main drawback from the ergonomic viewpoint is that because the force increase during swivelling is always constant and if a “light” user encounters excessive hardness during swivelling, this for a “heavy” user could possibly be insufficient.
- To obviate these drawbacks various solutions have already been proposed, such as those described in EP 1874161 or in U.S. Pat. No. 6,238,000, but these are costly and bulky.
- An object of the invention is to eliminate these drawbacks by providing an adjustment device which while being compact, sufficiently economical and of simple and very wide adjustment, is also ergonomically suitable for both very light and very heavy users.
- This and other objects which will be apparent from the ensuing description are attained according to the invention by an office chair mechanism as described in hereinafter.
- The present invention is further clarified hereinafter with reference to the accompanying drawing, in which:
-
FIG. 1 is a lateral schematic view of a chair provided with the device of the invention in its non-stressed condition, -
FIG. 2 shows it in the same view asFIG. 1 but in the stressed condition, -
FIG. 3 is an exploded perspective view of the device of the invention showing the adjustment system in detail, -
FIGS. 4 and 5 are schematic views of the device of the invention shown respectively in the chair empty and chair stressed configuration, -
FIGS. 6 and 7 show the device in the same views asFIGS. 4 and 5 but with the fulcrum in a different position, -
FIGS. 8 and 9 are schematic views of two different embodiments of the device of the invention, -
FIGS. 10 , 11 and 12 show a detail of the device of the invention for locking chair swivelling. - As can be seen from the figures, the adjustment device according to the invention is applied to an office chair mechanism consisting of a
fixed box structure 2 provided lowerly with a frusto-conical bush for inserting the upper end of theshaft 4 of a traditional gas spring (not represented in the drawings), the function of which is to sustain the support as it swivels relative to aresting base 6. - The
fixed box structure 2 is hinged about apin 8 slidable within a horizontal slottedhole 10 provided in asupport plate 12 for thechair seating portion 14. - A
bar 18 rigid with asupport arm 20 for theback rest 22 is pivoted about apin 16 on theplate 12. - The beam is finally pivoted to the
box structure 2 about apin 24. - About the
same pin 16 there is pivoted oneend 26 of a lever shapedbar 28 with its fulcrum on acontact element 30, in the illustrated example a pin, selectively positionable along tworesting surfaces box structure 2 and on thelever 28. - The
other end 36 of thelever 28 acts on ahelical spring 38 which acts against the surface of the box structure (seeFIGS. 4-7 ) or against the chair support plate 12 (seeFIG. 8 ) or against thesupport bar 18 for the back rest 22 (seeFIG. 9 ). - The adjustment of the position of the
contact element 30 takes place along saidparallel resting surfaces helical spring 38 and of thelever 28 is avoided. The element which undergoes movement is not subjected to compression when the surfaces are parallel, i.e. when the chair is in the rest position, whereas it becomes the fulcrum of thelever 28 during swivelling. The elements involved in the adjustment are therefore reduced to a minimum. This characteristic therefore enables easy and quick adjustment while using reliable low-cost components, for example by using asimple cam device 34 which moves the contact element (pin) 30. - The lever has a shape such that the
contact element 30, following its adjustment movement, maximizes the difference between the two lever arms. - This is obtained preferably by positioning the three points:
-
- 36 (spring resting end/lever)
- 30 contact element
- 16 articulation axis lever/movable parts
by aligning them along a single axis preferably perpendicular to the direction of the forces and by moving the contact element along said axis.
- The cam device is mounted on a
single control rod 40 which is provided at one end with aknob 42 for rotating thecam 34 and with aknob 44 for operating a gas spring, and at the other end with aknob 46 for locking the rotation of the back rest. - To facilitate sliding of the
element 30 which forms the lever fulcrum along thesurfaces slide shoes 48 of self-lubricating plastic material are provided (wrapped about the pin). - In the rear part of the box structure a catch is provided formed from two
plates 50 operable axially by anelastic puller 52 connected to theknob 46 controlling the locking operation. - The
plates 50 are selectively insertable into two of a plurality of facing seats 54 (six in the illustrated example) provided in thebar 18 such as to lock its rotation and hence lock the chair. - The operating principle of the device of the invention is as follows.
-
FIGS. 4 and 5 show the spring compression as the chair passes from a configuration in which the chair is not stressed to a configuration in which a user is seated on the chair and has inclined the back rest rearwards to hence stress the spring. - Operating the
knob 42 of the force adjustment device causes thecontact element 30 to move, this constituting the fulcrum of afirst order lever 28 having theelastic means 38 at oneend 36 and, at theother end 26, thepin 16 with one of themovable parts 18 of the geometry of which the mechanism is composed. By shifting the position of this fulcrum relative to the power and resistance points positioned at the twoends movable part 16. -
FIGS. 6 and 7 show the chair in the same configurations as inFIGS. 4 and 5 , but with thefulcrum 30 shifted along thesurfaces pivot pin 16. - From a comparison of these figures it is clear that the
spring 38, for the same back rest inclination (h1-h4), is more greatly compressed in the configuration shown inFIG. 7 than in the configuration shown inFIG. 5 , so that it offers greater swivel resistance. - Again comparing
FIGS. 5 and 7 , as thelever 28 is in equilibrium on thefulcrum 30, the moment of rotation R due to the reaction of thepin 16 about thefulcrum 30 is equal to the moment of rotation due to the thrust P of the spring about thesame fulcrum 30. - Hence in
FIG. 5 : -
Rb1=Pb2 - from which
-
R=Pb 2 /b 1 - Then on shifting the fulcrum, in
FIG. 7 we have -
R′=Pb 2 ′·b 1′ - Now as
-
b2′>b2 -
and -
b1′<b1, -
then -
R′>>R - with values of R′ double or even triple the values of R.
- In this manner, although using the same spring, persons of 40 kg and persons of 120 kg can both be supported by shifting the
fulcrum 30. - From the aforegoing it is apparent that the device of the invention presents numerous advantages, and in particular:
- chair versatility in that a mechanism is obtained with very wide force adjustment,
- very valid ergonomics in that the adjustment control is easy and rapid,
- less constructional complexity than similar devices and hence lesser costs,
- a compact mechanism design enabling the chair appearance to be improved.
Claims (10)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVE2010A000062A IT1403471B1 (en) | 2010-12-03 | 2010-12-03 | MECHANISM FOR OFFICE CHAIRS PROVIDED WITH A SWINGING FORCE ADJUSTMENT DEVICE. |
ITVE2010A000062 | 2010-12-03 | ||
ITVE2010A0062 | 2010-12-03 | ||
PCT/EP2011/071373 WO2012072675A1 (en) | 2010-12-03 | 2011-11-30 | Office chair mechanism provided with a device for adjusting the swivel force. |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130234485A1 true US20130234485A1 (en) | 2013-09-12 |
US8985688B2 US8985688B2 (en) | 2015-03-24 |
Family
ID=43737531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/879,970 Active 2031-12-23 US8985688B2 (en) | 2010-12-03 | 2011-11-30 | Office chair mechanism provided with a device for adjusting the swivel force |
Country Status (7)
Country | Link |
---|---|
US (1) | US8985688B2 (en) |
EP (1) | EP2645904B1 (en) |
CN (1) | CN103237479B (en) |
BR (1) | BR112013013094B1 (en) |
IT (1) | IT1403471B1 (en) |
PL (1) | PL2645904T3 (en) |
WO (1) | WO2012072675A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140125104A1 (en) * | 2011-07-15 | 2014-05-08 | Itoki Corporation | Rocking chair and spring unit used therein |
US20160113399A1 (en) * | 2013-05-11 | 2016-04-28 | Bock 1 Gmbh & Co., Kg | Synchronizing mechanism |
US20170164749A1 (en) * | 2015-12-09 | 2017-06-15 | Zhongwei Holding Group Co., Ltd | Chair tray and chassis, chassis forming method and chassis mounting structure of the same |
US10130184B2 (en) * | 2016-10-07 | 2018-11-20 | Pao Shen Enterprises Co., Ltd. | Adjusting mechanism and chair including the same |
WO2023171794A1 (en) * | 2022-03-11 | 2023-09-14 | 株式会社オカムラ | Chair |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6009891B2 (en) * | 2011-11-04 | 2016-10-19 | 株式会社岡村製作所 | Chair |
IT201600071468A1 (en) * | 2016-07-08 | 2018-01-08 | Co Fe Mo Ind S R L | OSCILLATION MECHANISM FOR CHAIRS |
US10155455B1 (en) * | 2017-06-14 | 2018-12-18 | Tung Yu O.A. Co., Ltd. | Combining structure between seat body and seat chassis of chair |
US11246417B2 (en) * | 2019-08-07 | 2022-02-15 | Chen Raizman | Tilt-swivel mechanism chair |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140125104A1 (en) * | 2011-07-15 | 2014-05-08 | Itoki Corporation | Rocking chair and spring unit used therein |
US9402478B2 (en) * | 2011-07-15 | 2016-08-02 | Itoki Corporation | Rocking chair and spring unit used therein |
US20160113399A1 (en) * | 2013-05-11 | 2016-04-28 | Bock 1 Gmbh & Co., Kg | Synchronizing mechanism |
US20170164749A1 (en) * | 2015-12-09 | 2017-06-15 | Zhongwei Holding Group Co., Ltd | Chair tray and chassis, chassis forming method and chassis mounting structure of the same |
US9788657B2 (en) * | 2015-12-09 | 2017-10-17 | Zhongwei Holding Group Co., Ltd | Chair tray and chassis, chassis forming method and chassis mounting structure of the same |
US10130184B2 (en) * | 2016-10-07 | 2018-11-20 | Pao Shen Enterprises Co., Ltd. | Adjusting mechanism and chair including the same |
WO2023171794A1 (en) * | 2022-03-11 | 2023-09-14 | 株式会社オカムラ | Chair |
Also Published As
Publication number | Publication date |
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ITVE20100062A1 (en) | 2012-06-04 |
IT1403471B1 (en) | 2013-10-17 |
BR112013013094A2 (en) | 2016-08-16 |
WO2012072675A1 (en) | 2012-06-07 |
EP2645904B1 (en) | 2014-08-20 |
EP2645904A1 (en) | 2013-10-09 |
CN103237479B (en) | 2016-03-23 |
CN103237479A (en) | 2013-08-07 |
US8985688B2 (en) | 2015-03-24 |
PL2645904T3 (en) | 2015-03-31 |
BR112013013094B1 (en) | 2020-03-03 |
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